I use Lee Filters. Most of the time I use the 1.2 soft grad for landscapes. I seem to get a good contrast between the land and sky with this one. I highly recommend this and possibly the 0.9 soft grad as well in case the 1.2 turns out to be a little to dark, or on the other hand, turns out that you need a little more than the 1.2. All these filters can be stacked. The Lee filter holder takes 3 at once.